EP0753390A1 - Injection mould for producing a plastic crate - Google Patents

Injection mould for producing a plastic crate Download PDF

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Publication number
EP0753390A1
EP0753390A1 EP96110639A EP96110639A EP0753390A1 EP 0753390 A1 EP0753390 A1 EP 0753390A1 EP 96110639 A EP96110639 A EP 96110639A EP 96110639 A EP96110639 A EP 96110639A EP 0753390 A1 EP0753390 A1 EP 0753390A1
Authority
EP
European Patent Office
Prior art keywords
mold
core
tool
box
jaw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96110639A
Other languages
German (de)
French (fr)
Other versions
EP0753390B1 (en
Inventor
Hans-Rudolf Kelpe
Horst Lange
Ernst Pichler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Friedrich Theysohn GmbH
Original Assignee
Friedrich Theysohn GmbH
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Filing date
Publication date
Application filed by Friedrich Theysohn GmbH filed Critical Friedrich Theysohn GmbH
Publication of EP0753390A1 publication Critical patent/EP0753390A1/en
Application granted granted Critical
Publication of EP0753390B1 publication Critical patent/EP0753390B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1705—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7134—Crates, e.g. for bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/737—Articles provided with holes, e.g. grids, sieves

Definitions

  • the invention relates to an injection mold according to the preamble of claim 1 (DE-PS 24 40 900).
  • Such a case is, for example, a bottle case.
  • it can also be a box for holding and transporting other goods, for example a fruit and vegetable box.
  • a fully loaded box has a considerable weight, so that the handle bars, which are mostly low in material and angular on the lower edge, cut into the hands of people carrying the box for reasons of weight. This applies in particular to boxes that are completely filled with bottles, which are often carried with just one hand.
  • a thickening with a circular cross-section is attached to the lower edge of the grip area of a box, against which the hand of a person carrying it rests.
  • the thickening has a cavity produced by gas injection so that its wall thickness corresponds approximately to that of the walls of the box. In practice, this box has been granted. Because of the round thickening, it is comfortable to wear even when filled.
  • DE-OS 42 17 343 describes an injection mold for the production of plastic boxes which have a handle with a hand-friendly profile.
  • the handle has, for example, a circularly curved edge.
  • an easily movable slide plate is arranged in a mold jaw which delimits the mold cavity of the injection mold on the outside.
  • One end face of the slide plate is shaped according to the desired profile of the handle. It limits the mold cavity during the injection molding process to make the box.
  • the handle strips are U-shaped and open at the bottom.
  • the box and the handle strips are stable. However, at their lower edge, against which the hand of the person carrying the same lies when the box is carried, they again have square edges which can cut into the hand.
  • the invention has for its object to design the injection molding tool described above so that the handles of a box made with the same can not cut into the hand of the same person carrying.
  • This injection molding tool can be used to inject boxes made of plastic, the handle strips of which have a lower edge that is rounded off without a shoulder.
  • the handle bar can no longer cut into the hand of a person carrying such a box.
  • the handle bar lies rather comfortably in the hand because of the round bottom edge. It is very stable due to the double-walled design with the completely enclosed cavity produced by gas injection.
  • the box can therefore be carried without any problems even when fully loaded.
  • the Injection molding tool for the production of the box can remain unchanged in its essential structure.
  • an underfloor slide valve must only be arranged in the fixed core per handle strip.
  • a jaw slide is to be attached to each movable bar in the movable mold jaws, which can simultaneously serve to supply the gas via a nozzle with which the cavity of the respective handle bar is created.
  • the box 1 shown in Fig. 1 made of plastic is made by injection molding. It has an arbitrarily designed base 2 and walls 3 which protrude at right angles from it and are connected to one another. Compartments and other existing structures of the floor 2 are not shown for the sake of simplicity.
  • all four walls 3 of the box 1 have an opening 4.
  • the grip bar 5 has a rounded lower edge 6. It is hollow.
  • the handle bar 5 has two part walls 7 and 8, which delimit a cavity. The cavity extends over the entire length and height of the handle bar 5. Due to the overall hollow design, the handle bar 5 has the effect of a tube. It is particularly stabilized against bending stresses.
  • the injection mold for producing a box 1 - hereinafter referred to as "tool" - consists of a nozzle part 9 which is normally stationary and one in the direction of the Double arrow 10 movable closing part 11.
  • the nozzle part 9 could also be movable and the closing part 11 could be fixed.
  • the nozzle part 9 has a base plate 13 which, in the working position with the tool closed, lies on the base 2 of the box 1 to be produced.
  • the locking part 11 of the tool includes a core 14 which, when the tool is closed, delimits the mold cavity 12 from the inside.
  • the nozzle part 9, via which the spray material is fed to the mold cavity 12, has four base jaws 15, each offset by 90 ° from one another. They are firmly connected to the nozzle part 9 and surround the core 14 at a distance all around.
  • the inner surfaces of the base jaws 15 facing the core 14 run so obliquely that their distance from the core 14 increases with increasing distance from the nozzle part 9.
  • molded jaws 17 are guided in the guides 16 and can be moved hydraulically in the direction of the double arrow 10, for example. In the closed position of the tool shown in FIG. 3, the mold jaws 17 limit the mold cavity 12 from the outside. They each have a projection 18 which bears against the core 14 in the working position. The projections 18 thus interrupt the mold cavity 12. They are used to produce the openings 4 in the walls 3 of the box 1.
  • a box 1 is injected by filling the mold cavity 12.
  • the tool is opened.
  • the closing part 11 with the core 14 and at the same time the mold jaws 17 are moved in the direction of the arrow 19. Since the mold jaws 17 are simultaneously moved outwards during this movement, their projections 18 come free from the walls 3 of the box 1.
  • the finished box 1 can then be removed from the tool.
  • an underfloor slide valve 20 is arranged in the core 14 according to FIGS. 5 to 7 and a jaw slide valve 21 is arranged in the corresponding mold jaw 17.
  • the underfloor slide valve 20 is, for example, hydraulically displaceable by the distance A in the direction of the double arrow 22. It stands out in the 5 visible working position into the part of the mold cavity 12 provided for the grip strip 5, that is to say beyond the associated edge 23 of the core 14.
  • the underfloor slide 20 is moved by the distance A in the direction of arrow 24. It then assumes the position shown in FIG. 6.
  • the jaw slide 21 is movably mounted in the mold jaw 17 in the direction of the double arrow 25. In the closed position of the tool shown in FIG. 5, the jaw slide 21 is part of the projection 18 of the mold jaw 17. It then lies with the end face of its outwardly flared tip 26 on the core 14.
  • the jaw slide 21 also includes a spring 27 through which the tip 26 is constantly pressed in the direction of the arrow 28, that is to say into its working position shown in FIG. 5. Instead of the spring 27, a pneumatics or hydraulics acting in the same way could also be used.
  • the shaped jaw 17 has a conically widened opening for receiving the conically designed tip 26 of the jaw slide 21. In the tip 26 of the jaw slide 21, an arc-shaped trough 29 is attached over its entire length to form the round lower edge 6 of the handle bar 5.
  • the handle bar 5 is hollow according to FIG. 2.
  • gas is injected under pressure into the part of the mold cavity 12 provided for the grip strip. This can be done by means of a nozzle 33 which is arranged in the jaw slide 21 including the feed line 34.
  • the underfloor slide valve 20 is moved in the direction of arrow 24 into its end position shown in FIG. 6.
  • the arrangement and mode of operation of the underfloor slide valve 20 and jaw slide valve 21 apply unchanged to each wall 3 of the box 1, which is to be provided with a grip strip 5 by forming an opening 4.
  • the nozzle 33 with the feed line 34 could also be attached to another location on the tool, as long as it opens into the mold cavity 12 at the location provided for the grip strip 5.
  • Nitrogen for example, can be used as the gas to form a hollow grip strip 5. The gas is pressed into the spray material, for example at a pressure of 50 to 80 bar.

Abstract

This injection moulding tool forms a rectangular plastic box, with base and four walls. The walls have penetrations and strips used as handles, near the top. The handle strips include a hollow space, in double-walled construction. The moulding tool has a fixed nozzle section and a moving section which together enclose the moulding cavity. On the moving section is a core which defines the inside of the cavity, and which is brought up to the nozzle section. On the nozzle section, there are four main mould jaws offset at about 90 degrees to each other, which surround the core with clearance. They are so angled to face the core surfaces, that their clearance increases, with increasing distance from the nozzle section.

Description

Die Erfindung bezieht sich aufein Spritzgießwerkzeug gemäß dem Oberbegriff des Patentanspruchs 1 (DE-PS 24 40 900).The invention relates to an injection mold according to the preamble of claim 1 (DE-PS 24 40 900).

Ein derartiger Kasten ist beispielsweise ein Flaschenkasten. Es kann sich aber auch um einen Kasten zur Aufnahme und zum Transport anderer Güter handeln, beispielsweise um einen Obst- und Gemüsekasten. Ein voll beladener Kasten hat ein erhebliches Gewicht, so daß die aus Gewichtsgründen meist materialarmen und an der Unterkante eckigen Griffleisten in die Hände von den Kasten tragenden Personen einschneiden. Das gilt insbesondere für vollständig mit gefüllten Flaschen bestückte Kästen, die oft mit nur einer Hand getragen werden.Such a case is, for example, a bottle case. However, it can also be a box for holding and transporting other goods, for example a fruit and vegetable box. A fully loaded box has a considerable weight, so that the handle bars, which are mostly low in material and angular on the lower edge, cut into the hands of people carrying the box for reasons of weight. This applies in particular to boxes that are completely filled with bottles, which are often carried with just one hand.

Dieser Mangel von bekannten, auf dem Markt im Einsatz befindlichen Kästen soll bei dem aus der EP 0 260 698 A1 bekannten Kasten dadurch vermieden werden, daß an den Griffleisten desselben innen eine Vielzahl von dicht liegenden Lamellen angebracht wird. Da die Lamellen verhindern, daß die Finger einer den Kasten tragenden Person weit um den Griffrand herumfassen können, ergibt sich insgesamt eine verbesserte Griffläche. Es bleibt aber gerade im Übergangsbereich vom parallel zum Boden des Kastens im Griffbereich verlaufenden Rand desselben zu den Lamellen eine relativ scharfe Kante, auch wenn der Rand gewölbt ist. Diese Kante schneidet nach wie vor besonders dann in die Hand einer den Kasten tragenden Person ein, weg der Kasten in Schräglage nur mit einer Hand getragen wird. Die relativ langen Lamellen bedeuten für diesen bekannten Kasten außerdem einen nicht unerheblichen zusätzlichen Materialaufwand.This lack of known boxes currently in use on the market is to be avoided in the box known from EP 0 260 698 A1 by attaching a large number of closely spaced slats to the handle strips of the same. Since the slats prevent the fingers of a person carrying the box from reaching far around the edge of the handle, this results in an overall improved grip surface. However, in the transition area from the edge of the box parallel to the bottom of the box in the grip area to the slats, a relatively sharp edge remains, even if the edge is curved. This edge still cuts into the hand of a person carrying the box, especially since the box is tilted with only one hand. The relatively long slats also mean a not inconsiderable additional material expenditure for this known box.

Mit dem aus der DE-PS 38 23 650 bekannten Verfahren wird an der Unterkante des Griffbereichs eines Kastens, an dem die Hand einer denselben tragenden Person anliegt, eine Verdickung mit kreisförmigem Querschnitt angebracht. Die Verdickung weist einen durch Gasinjektion hergestellten Hohlraum auf so daß ihre Wanddicke etwa derjenigen der Wände des Kastens entspricht. Dieser Kasten hat sich in der Praxis gewährt. Er ist wegen der runden Verdickung auch in gefülltem Zustand angenehm zu tragen.With the method known from DE-PS 38 23 650, a thickening with a circular cross-section is attached to the lower edge of the grip area of a box, against which the hand of a person carrying it rests. The thickening has a cavity produced by gas injection so that its wall thickness corresponds approximately to that of the walls of the box. In practice, this box has been granted. Because of the round thickening, it is comfortable to wear even when filled.

Die DE-OS 42 17 343 beschreibt eine Spritzgießform zur Herstellung von Kästen aus Kunststoff, die einen Handgriff mit einer handfreundlichen Profilierung aufweisen. Der Handgriff hat beispielsweise einen kreisförmig gebogenen Rand. Zur beschädigungsfreien Ausformung dieser Profilierung ist in einer den Formhohlraum der Spritzgießform außen begrenzenden Formbacke eine leicht bewegliche Schieberplatte angeordnet. Eine Stirnfläche der Schieberplatte ist entsprechend der gewünschten Profilierung des Handgriffs geformt. Sie begrenzt den Formhohlraum während des Spritzvorgangs zur Herstellung des Kastens.DE-OS 42 17 343 describes an injection mold for the production of plastic boxes which have a handle with a hand-friendly profile. The handle has, for example, a circularly curved edge. For damage-free shaping of this profile, an easily movable slide plate is arranged in a mold jaw which delimits the mold cavity of the injection mold on the outside. One end face of the slide plate is shaped according to the desired profile of the handle. It limits the mold cavity during the injection molding process to make the box.

Mit dem Spritzgießwerkzeug nach der eingangs erwähnten DE-PS 24 40 900 werden Kästen hergestellt, deren Griffleisten U-förmig ausgebildet und nach unten offen sind. Der Kasten und die Griffleisten sind stabil. Sie haben jedoch an ihrer Unterkante, an der beim Tragen des Kastens die Hand der denselben tragenden Person anliegt, wieder eckige Kanten, die in die Hand einschneiden können.With the injection mold according to the aforementioned DE-PS 24 40 900 boxes are made, the handle strips are U-shaped and open at the bottom. The box and the handle strips are stable. However, at their lower edge, against which the hand of the person carrying the same lies when the box is carried, they again have square edges which can cut into the hand.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene Spritzgießwerkzeug so zu gestalten, daß die Griffleisten eines mit derselben hergestellten Kastens nicht in die Hand von denselben tragenden Personen einschneiden können.The invention has for its object to design the injection molding tool described above so that the handles of a box made with the same can not cut into the hand of the same person carrying.

Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst.This object is achieved in accordance with the characterizing features of patent claim 1.

Mit diesem Spritzgießwerkzeug können Kästen aus Kunststoffgespritzt werden, deren Griffleisten eine absatzfrei gerundete Unterkante haben. Die Griffleiste kann dadurch nicht mehr in die Hand einer einen solchen Kasten tragenden Person einschneiden. Die Griffleiste liegt vielmehr wegen der runden Unterkante angenehm in der Hand. Sie ist durch die doppelwandige Ausführung mit dem durch Gasinjektion erzeugten, vollständig umschlossenen Hohlraum sehr stabil. Der Kasten kann somit auch voll beladen problemlos getragen werden. Das Spritzgießwerkzeug zur Herstellung des Kastens kann in seinem wesentlichen Aufbau unverändert bleiben. Es muß einerseits lediglich im feststehenden Kern pro Griffleiste ein Unterflurschieber angeordnet werden. Auf der anderen Seite ist pro Griffleiste in den beweglichen Formbacken ein Backenschieber anzubringen, der gleichzeitig zur Zuführung des Gases über eine Düse dienen kann, mit welchem der Hohlraum der jeweiligen Griffleiste erzeugt wird.This injection molding tool can be used to inject boxes made of plastic, the handle strips of which have a lower edge that is rounded off without a shoulder. The handle bar can no longer cut into the hand of a person carrying such a box. The handle bar lies rather comfortably in the hand because of the round bottom edge. It is very stable due to the double-walled design with the completely enclosed cavity produced by gas injection. The box can therefore be carried without any problems even when fully loaded. The Injection molding tool for the production of the box can remain unchanged in its essential structure. On the one hand, an underfloor slide valve must only be arranged in the fixed core per handle strip. On the other hand, a jaw slide is to be attached to each movable bar in the movable mold jaws, which can simultaneously serve to supply the gas via a nozzle with which the cavity of the respective handle bar is created.

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in den Zeichnungen dargestellt.An embodiment of the subject of the invention is shown in the drawings.

Es zeigen:

  • Fig. 1 eine perspektivische Ansicht eines mit dem Spritzgießwerkzeug nach der Erfindung herstellbaren Kastens.
  • Fig. 2 einen Schnitt durch Fig. 1 längs der Linie II - II in vergrößerter Darstellung.
  • Fig. 3 einen Schnitt durch das Spritzgießwerkzeug in geschlossener Arbeitsstellung.
  • Fig. 4 eine Draufsicht auf den Düsenteil des Spritzgießwerkzeugs.
  • Fig. 5 eine Einzelheit des Spritzgießwerkzeugs in Arbeitsstellung in vergrößerter Darstellung.
  • Fig. 6 und 7 die Einzelheit nach Fig. 5 in zwei unterschiedlichen Zwischenstellungen nach dem Öffnen des Spritzgießwerkzeugs.
Show it:
  • Fig. 1 is a perspective view of a box that can be produced with the injection mold according to the invention.
  • Fig. 2 shows a section through Fig. 1 along the line II - II in an enlarged view.
  • Fig. 3 shows a section through the injection mold in the closed working position.
  • Fig. 4 is a plan view of the nozzle part of the injection mold.
  • Fig. 5 shows a detail of the injection mold in the working position in an enlarged view.
  • 6 and 7 the detail of FIG. 5 in two different intermediate positions after opening the injection mold.

Der in Fig. 1 dargestellte Kasten 1 aus Kunststoff ist durch Spritzgießen hergestellt. Er weist einen beliebig gestalteten Boden 2 und Wände 3 auf, die rechtwinklig von demselben abstehen und untereinander verbunden sind. Gefache und andere gegebenenfalls vorhandene Aufbauten des Bodens 2 sind der Einfachheit halber nicht mit eingezeichnet. In mindestens einer der Wände 3 ist eine Durchbrechung 4 angebracht, durch welche am oberen, dem Boden 2 abgewandten Rand des Kastens 1 eine Griffleiste 5 zum Tragen des Kastens 1 gebildet ist. Im dargestellten Ausführungsbeispiel haben alle vier Wände 3 des Kastens 1 eine Durchbrechung 4. Die Griffleiste 5 hat gemäß Fig. 2 eine abgerundete Unterkante 6. Sie ist hohl ausgeführt. Dadurch hat die Griffleiste 5 zwei Teilwände 7 und 8, die einen Hohlraum begrenzen. Der Hohlraum erstreckt sich über die gesamte Länge und Höhe der Griffleiste 5. Durch die insgesamt hohle Ausführung hat die Griffleiste 5 die Wirkung eines Rohres. Sie ist insbesondere gegenüber Biegebeanspruchungen stabilisiert.The box 1 shown in Fig. 1 made of plastic is made by injection molding. It has an arbitrarily designed base 2 and walls 3 which protrude at right angles from it and are connected to one another. Compartments and other existing structures of the floor 2 are not shown for the sake of simplicity. In at least one of the walls 3 there is an opening 4 through which a grip strip 5 for carrying the box 1 is formed on the upper edge of the box 1 facing away from the bottom 2. In the illustrated embodiment, all four walls 3 of the box 1 have an opening 4. According to FIG. 2, the grip bar 5 has a rounded lower edge 6. It is hollow. As a result, the handle bar 5 has two part walls 7 and 8, which delimit a cavity. The cavity extends over the entire length and height of the handle bar 5. Due to the overall hollow design, the handle bar 5 has the effect of a tube. It is particularly stabilized against bending stresses.

Das Spritzgießwerkzeug zum Herstellen eines Kastens 1 - im folgenden kurz "Werkzeug" genannt - besteht aus einem im Normalfall feststehenden Düsenteil 9 und einem in Richtung des Doppelpfeils 10 bewegbaren Schließteil 11. Grundsätzlich könnten auch der Düsenteil 9 beweglich und der Schließteil 11 feststehend ausgeführt sein. Zwischen Düsenteil 9 und Schließteil 11 liegt ein Formhohlraum 12, der den Abmessungen und der Gestaltung eines herzustellenden Kastens 1 entspricht. Der Düsenteil 9 weist eine Bodenplatte 13 auf, die in Arbeitsposition bei geschlossenem Werkzeug am Boden 2 des zu erzeugenden Kastens 1 liegt.The injection mold for producing a box 1 - hereinafter referred to as "tool" - consists of a nozzle part 9 which is normally stationary and one in the direction of the Double arrow 10 movable closing part 11. In principle, the nozzle part 9 could also be movable and the closing part 11 could be fixed. Between the nozzle part 9 and the closing part 11 there is a mold cavity 12 which corresponds to the dimensions and the design of a box 1 to be produced. The nozzle part 9 has a base plate 13 which, in the working position with the tool closed, lies on the base 2 of the box 1 to be produced.

Zum Schließteil 11 des Werkzeugs gehört ein Kern 14, der bei geschlossenem Werkzeug den Formhohlraum 12 von innen begrenzt. Der Düsenteil 9, über den das Spritzmaterial dem Formhohlraum 12 zugeführt wird, hat vier jeweils um 90° gegeneinander versetzte Grundbacken 15. Sie sind fest mit dem Düsenteil 9 verbunden und umgeben den Kern 14 mit Abstand rundum. Die dem Kern 14 zugewandten Innenflächen der Grundbacken 15 verlaufen derart schräg, daß ihr Abstand zum Kern 14 mit zunehmender Entfernung vom Düsenteil 9 zunimmt.The locking part 11 of the tool includes a core 14 which, when the tool is closed, delimits the mold cavity 12 from the inside. The nozzle part 9, via which the spray material is fed to the mold cavity 12, has four base jaws 15, each offset by 90 ° from one another. They are firmly connected to the nozzle part 9 and surround the core 14 at a distance all around. The inner surfaces of the base jaws 15 facing the core 14 run so obliquely that their distance from the core 14 increases with increasing distance from the nozzle part 9.

An den Innenflächen der Grundbacken 15 sind Führungen 16 angebracht, die entsprechend Fig. 4 beispielsweise T-förmig ausgebildet sein können. In den Führungen 16 sind Formbacken 17 geführt, die beispielsweise hydraulisch in Richtung des Doppelpfeils 10 verschiebbar sind. In der in Fig. 3 dargestellten Schließstellung des Werkzeugs begrenzen die Formbacken 17 den Formhohlraum 12 von außen. Sie haben jeweils einen Vorsprung 18, der in der Arbeitsposition am Kern 14 anliegt. Die Vorsprünge 18 unterbrechen somit den Formhohlraum 12. Sie dienen zur Herstellung der Durchbrechungen 4 in den Wänden 3 des Kastens 1.On the inner surfaces of the base jaws 15, guides 16 are attached, which can be T-shaped, for example, according to FIG. 4. Molded jaws 17 are guided in the guides 16 and can be moved hydraulically in the direction of the double arrow 10, for example. In the closed position of the tool shown in FIG. 3, the mold jaws 17 limit the mold cavity 12 from the outside. They each have a projection 18 which bears against the core 14 in the working position. The projections 18 thus interrupt the mold cavity 12. They are used to produce the openings 4 in the walls 3 of the box 1.

In der in Fig. 3 dargestellten Schließstellung des Werkzeugs wird durch Füllung des Formhohlraums 12 ein Kasten 1 gespritzt. Sobald das Spritzmaterial ausreichend fest geworden ist, wird das Werkzeug geöffnet. Dazu werden der Schließteil 11 mit dem Kern 14 und gleichzeitig die Formbacken 17 in Richtung des Pfeiles 19 bewegt. Da die Formbacken 17 bei dieser Bewegung gleichzeitig nach außen bewegt werden, kommen deren Vorsprünge 18 von den Wänden 3 des Kastens 1 frei. Der fertige Kasten 1 kann dann aus dem Werkzeug entnommen werden.In the closed position of the tool shown in FIG. 3, a box 1 is injected by filling the mold cavity 12. As soon as the spray material has hardened sufficiently, the tool is opened. For this purpose, the closing part 11 with the core 14 and at the same time the mold jaws 17 are moved in the direction of the arrow 19. Since the mold jaws 17 are simultaneously moved outwards during this movement, their projections 18 come free from the walls 3 of the box 1. The finished box 1 can then be removed from the tool.

Zur Formung einer speziell gestalteten, aus Fig. 2 im Querschnitt ersichtlichen Griffleiste 5 sind gemäß den Fig. 5 bis 7 im Kern 14 ein Unterflurschieber 20 und in der korrespondierenden Formbacke 17 ein Backenschieber 21 angeordnet. Der Unterflurschieber 20 ist beispielsweise hydraulisch um die Strecke A in Richtung des Doppelpfeils 22 verschiebbar. Er ragt in der aus Fig. 5 ersichtlichen Arbeitsposition in den für die Griffleiste 5 vorgesehenen Teil des Formhohlraums 12 hinein, also über die zugehörige Kante 23 des Kerns 14 hinaus. Zur Erzeugung der hohlen Griffleiste 5 wird der Unterflurschieber 20 um die Strecke A in Richtung des Pfeiles 24 bewegt. Er nimmt dann die aus Fig. 6 ersichtliche Position ein.To form a specially designed handle strip 5, which can be seen in FIG. 2 in cross section, an underfloor slide valve 20 is arranged in the core 14 according to FIGS. 5 to 7 and a jaw slide valve 21 is arranged in the corresponding mold jaw 17. The underfloor slide valve 20 is, for example, hydraulically displaceable by the distance A in the direction of the double arrow 22. It stands out in the 5 visible working position into the part of the mold cavity 12 provided for the grip strip 5, that is to say beyond the associated edge 23 of the core 14. To produce the hollow grip bar 5, the underfloor slide 20 is moved by the distance A in the direction of arrow 24. It then assumes the position shown in FIG. 6.

Der Backenschieber 21 ist in der Formbacke 17 in Richtung des Doppelpfeiles 25 beweglich gelagert. In der aus Fig. 5 ersichtlichen Schließstellung des Werkzeugs ist der Backenschieber 21 Teil des Vorsprungs 18 der Formbacke 17. Er liegt dann mit der Stirnfläche seiner nach außen konisch erweiterten Spitze 26 am Kern 14 an Zum Backenschieber 21 gehört auch eine Feder 27, durch welche die Spitze 26 ständig in Richtung des Pfeiles 28 gedrückt wird, also in ihre aus Fig. 5 ersichtliche Arbeitsposition. Statt der Feder 27 könnte auch eine in gleicher Weise wirkende Pneumatik oder auch eine Hydraulik eingesetzt werden. Die Formbacke 17 hat eine konisch aufgeweitete Durchbrechung zur Aufnahme der konisch ausgeführten Spitze 26 des Backenschiebers 21. In der Spitze 26 des Backenschiebers 21 ist über deren ganze Länge eine kreisbogenförmig gestaltete Mulde 29 zur Formung der runden Unterkante 6 der Griffleiste 5 angebracht.The jaw slide 21 is movably mounted in the mold jaw 17 in the direction of the double arrow 25. In the closed position of the tool shown in FIG. 5, the jaw slide 21 is part of the projection 18 of the mold jaw 17. It then lies with the end face of its outwardly flared tip 26 on the core 14. The jaw slide 21 also includes a spring 27 through which the tip 26 is constantly pressed in the direction of the arrow 28, that is to say into its working position shown in FIG. 5. Instead of the spring 27, a pneumatics or hydraulics acting in the same way could also be used. The shaped jaw 17 has a conically widened opening for receiving the conically designed tip 26 of the jaw slide 21. In the tip 26 of the jaw slide 21, an arc-shaped trough 29 is attached over its entire length to form the round lower edge 6 of the handle bar 5.

Bei der Entformung des Kastens 1 werden der Kern 14 und die Formbacke 17 - wie bereits bei Fig. 3 erwähnt - in Richtung des Pfeiles 19 bewegt. Die gleichzeitig nach außen gerichtete Bewegung der Formbacke 17 macht der Backenschieber 21 nicht mit, da er mit seinem Kern 30, der von der Feder 27 umschlossen ist, an einem Anschlag 31 anliegt und an demselben entlang gleitet. Dabei wird die Feder 27 durch den Druckkörper 32 zusammengedrückt. Die Spitze 26 des Backenschiebers 21 liegt also weiter fest am Kern 14 an. Erst wenn der Vorsprung 18 der Formbacke 17 vollständig von der entsprechenden Wand des Kastens 1 frei gekommen ist, wird der Weg der Formbacke 17 und damit der Weg des Backenschiebers 21 in Richtung des Pfeiles 19 begrenzt. Die Griffleiste 5 des Kastens 1 tritt dann aus der Mulde 30 aus. Sie hat eine der Form der Mulde 30 entsprechende, wohlgerundete Unterkante 6. Diese Endposition des Werkzeugs geht aus Fig. 7 hervor.When the box 1 is removed from the mold, the core 14 and the mold jaw 17 - as already mentioned in FIG. 3 - are moved in the direction of the arrow 19. The jaw slide 21 does not follow the simultaneously outward movement of the mold jaw 17, since its core 30, which is enclosed by the spring 27, rests against a stop 31 and slides along it. The spring 27 is compressed by the pressure body 32. The tip 26 of the jaw slide 21 is thus still firmly against the core 14. Only when the projection 18 of the mold jaw 17 has come completely free from the corresponding wall of the box 1, is the path of the mold jaw 17 and thus the path of the jaw slide 21 limited in the direction of arrow 19. The handle 5 of the box 1 then emerges from the recess 30. It has a well-rounded lower edge 6 corresponding to the shape of the trough 30. This end position of the tool is shown in FIG. 7.

Die Griffleiste 5 wird entsprechend Fig. 2 hohl ausgeführt. Dazu wird nach dem Einbringen des Spritzmaterials in den Formhohlraum 12 des Werkzeugs Gas unter Druck in den für die Griffleiste vorgesehenen Teil des Formhohlraums 12 injiziert. Das kann mittels einer Düse 33 erfolgen, die einschließlich Zuleitung 34 im Backenschieber 21 angeordnet ist. Während der Gaszuführ wird der Unterflurschieber 20 in Richtung des Pfeiles 24 in seine aus Fig. 6 ersichtliche Endstellung bewegt.The handle bar 5 is hollow according to FIG. 2. For this purpose, after introducing the spray material into the mold cavity 12 of the tool, gas is injected under pressure into the part of the mold cavity 12 provided for the grip strip. This can be done by means of a nozzle 33 which is arranged in the jaw slide 21 including the feed line 34. During the Gas supply, the underfloor slide valve 20 is moved in the direction of arrow 24 into its end position shown in FIG. 6.

Anordnung und Wirkungsweise von Unterflurschieber 20 und Backenschieber 21 gelten unverändert für jede Wand 3 des Kastens 1, die durch Ausformung einer Durchbrechung 4 mit einer Griffleiste 5 versehen werden soll. Die Düse 33 mit Zuleitung 34 könnte auch an einer anderen Stelle des Werkzeugs angebracht sein, solange sie an der für die Griffleiste 5 vorgesehenen Stelle in den Formhohlraum 12 mündet. Als Gas zur Bildung einer hohlen Griffleiste 5 kann beispielsweise Stickstoff verwendet werden. Das Gas wird beispielsweise mit einem Druck von 50 bis 80 Bar in das Spritzmaterial eingepreßt.The arrangement and mode of operation of the underfloor slide valve 20 and jaw slide valve 21 apply unchanged to each wall 3 of the box 1, which is to be provided with a grip strip 5 by forming an opening 4. The nozzle 33 with the feed line 34 could also be attached to another location on the tool, as long as it opens into the mold cavity 12 at the location provided for the grip strip 5. Nitrogen, for example, can be used as the gas to form a hollow grip strip 5. The gas is pressed into the spray material, for example at a pressure of 50 to 80 bar.

Claims (2)

Spritzgießwerkzeug zur Herstellung eines aus Kunststoffbestehenden Kastens, der einen Boden und vier rechtwinklig von demselben abstehende, zusammenhängende Wände aufweist und bei dem mindestens eine der Wände an ihrem dem Boden abgewandten Ende eine durch eine Durchbrechung derselben gebildete Griffleiste hat, die unter Einschluß eines Hohlraums doppelwandig ausgebildet ist, bestehend aus einem Werkzeug mit einem feststehenden Düsenteil und einem beweglichen Schließteil, zwischen denen bei geschlossenem Werkzeug ein Formhohlraum eingeschlossen ist, bei welcher am beweglichen Schließteil des Werkzeugs ein in Richtung des Düsenteils weisender, den Formhohlraum innen begrenzender Kern angebracht ist, bei welcher am Düsenteil vier jeweils um 90° gegeneinander versetzte Grundbacken befestigt sind, die in Richtung des Schließteils weisen und den Kern von außen mit Abstand umgeben und deren dem Kern zugewandte Innenflächen derart schräg verlaufen, daß ihr Abstand vom Kern mit zunehmender Entfernung vom Düsenteil zunimmt, bei welcher an den schrägen, mit Führungen versehenen Innenflächen der Grundbacken bewegliche, in den Führungen geführte Formbacken angebracht sind, die bei geschlossenem Werkzeug den Formhohlraum von außen begrenzen und zur Erzeugung einer Durchbrechung in der entsprechenden Wand des Kastens einen in den Formhohlraum hineinragenden, am Kern anliegenden Vorsprung haben, und bei welcher pro zu erzeugender Griffleiste in der entsprechenden Formbacke ein im rechten Winkel zur Achse des Werkzeugs relativ zur Formbacke verstellbarer Backenschieber angeordnet ist, der mit Steuer- und Bewegungselementen ausgerüstet ist, durch welche er beim Entformen des Kastens erst bei vom Werkzeug gelöstem Kasten bewegbar ist, dadurch gekennzeichnet, - daß im Kern (14) in Höhe jeder zu erzeugenden Griffleiste (5) ein Unterflurschieber (20) angebracht ist, der rechtwinklig zur Schließbewegung des Spritzgießwerkzeugs verstellbar ist und während des Spritzgießens mit seiner Stirnfläche in den zur Bildung der Griffleiste (5) vorgesehenen Teil des Formhohlraums (12) hineinragt, - daß im Werkzeug pro zu erzeugender Griffleiste (5) eine Düse (33) zum Eindrücken von Gas in das Spritzmaterial vorhanden ist, welches sich in dem für die Griffleiste (5) vorgesehenen Teil des Formhohlraums (12) befindet und - daß der bei geschlossenem Spritzgießwerkzeug als Teil des Vorsprungs (18) der entsprechenden Formbacke (17) am Kern (14) anliegende Backenschieber (21) mit einer kreisbogenförmig gestalteten Mulde (29) zur Formung der Unterkante (6) der Griffleiste (5) ausgerüstet ist, der beim Entformen des Kastens (1) zunächst bei in Entformungsrichtung und gleichzeitig nach außen bewegter Formbacke (17) weiter am Kern (14) anliegt und erst nachdem die Griffleiste (5) aus der Mulde (29) ausgetreten ist, axial nach außen in seine Arbeitsposition in der Formbacke (17) rückstellbar ist. Injection molding tool for producing a box made of plastic, which has a base and four continuous walls projecting therefrom at right angles and in which at least one of the walls at its end facing away from the base has a grip strip formed by an opening in the same, which is double-walled, including a cavity is composed of a tool with a fixed nozzle part and a movable closing part, between which, when the tool is closed, a mold cavity is enclosed, in which a core which points in the direction of the nozzle part and which delimits the mold cavity on the inside is attached to the movable closing part of the tool, on which Nozzle part four base jaws, each offset by 90 °, are fastened, which point in the direction of the closing part and surround the core from the outside at a distance and whose inner surfaces facing the core are inclined in such a way that their distance from the core Increasing distance from the nozzle part increases, at which on the inclined, provided with guides of the base jaws movable, guided in the guides mold jaws are attached, which limit the mold cavity from the outside when the tool is closed and to create an opening in the corresponding wall of the box one in have the protruding mold cavity, abutting the core, and in which for each handle bar to be produced in the corresponding mold jaw, a jaw slide is arranged at right angles to the axis of the tool relative to the mold jaw, which is equipped with control and movement elements, by which it during De-molding of the box is only movable when the box is detached from the tool, characterized in that - That in the core (14) at the level of each handle bar (5) to be produced, an underfloor slide valve (20) is attached, which is adjustable at right angles to the closing movement of the injection mold and during injection molding with its end face in the part provided for forming the handle bar (5) of the mold cavity (12) protrudes, - That in the tool for each handle bar (5) to be produced there is a nozzle (33) for pressing gas into the spray material, which is located in the part of the mold cavity (12) provided for the handle bar (5) and - That the closed molding tool as part of the projection (18) of the corresponding mold jaw (17) on the core (14) adjacent jaw slide (21) equipped with an arcuate trough (29) for forming the lower edge (6) of the handle (5) which, when the box (1) is removed from the mold, initially rests against the core (14) with the mold jaw (17) moved in the demolding direction and at the same time outwards, and only axially outwards after the grip bar (5) has emerged from the recess (29) is resettable in its working position in the mold jaw (17). Spritzgießwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß die Düse (33) zum Eindrücken des Gases einschließlich Zuleitung (34) jeweils in dem Backenschieber (21) angeordnet ist.Injection molding tool according to claim 1, characterized in that the nozzle (33) for pressing in the gas including the feed line (34) is arranged in each case in the jaw slide (21).
EP96110639A 1995-07-08 1996-07-02 Injection mould for producing a plastic crate Expired - Lifetime EP0753390B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19525000A DE19525000C1 (en) 1995-07-08 1995-07-08 Injection mold for the production of a box made of plastic
DE19525000 1995-07-08

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EP0753390A1 true EP0753390A1 (en) 1997-01-15
EP0753390B1 EP0753390B1 (en) 2000-01-05

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AT (1) ATE188415T1 (en)
DE (2) DE19525000C1 (en)
PT (1) PT753390E (en)

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EP1484154A1 (en) * 2003-06-06 2004-12-08 Plamatec AG Multimaterial injection molding using the core-back process
NL1027896C2 (en) * 2004-12-27 2006-06-30 Ecim Technologies Bv Mold and method for forming plastic products.
DE102008015382A1 (en) * 2008-03-20 2009-09-24 Linpac Allibert Gmbh Integrally made of plastic bottle carrier and serving for its production mold

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DE10210076B4 (en) 2002-03-08 2004-10-14 Theysohn Formenbau Gmbh injection mold

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JPH05329893A (en) * 1992-03-30 1993-12-14 Sekisui Chem Co Ltd Injection mold
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP1484154A1 (en) * 2003-06-06 2004-12-08 Plamatec AG Multimaterial injection molding using the core-back process
NL1027896C2 (en) * 2004-12-27 2006-06-30 Ecim Technologies Bv Mold and method for forming plastic products.
WO2006071112A1 (en) * 2004-12-27 2006-07-06 Ecim Technologies B.V. Mold and method for forming plastic products
US7785523B2 (en) 2004-12-27 2010-08-31 Ecim Technologies B.V. Mold and method for forming plastic products
DE102008015382A1 (en) * 2008-03-20 2009-09-24 Linpac Allibert Gmbh Integrally made of plastic bottle carrier and serving for its production mold

Also Published As

Publication number Publication date
PT753390E (en) 2000-05-31
ATE188415T1 (en) 2000-01-15
EP0753390B1 (en) 2000-01-05
DE59604088D1 (en) 2000-02-10
DE19525000C1 (en) 1997-01-30

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